A TOPRAN brand Tensioner Pulley, timing belt is a part of the timing belt drive, which serves to bypass the belt in a certain place or several places and is a freely rotating pulley of small diameter.

The composition of the roller is small: it is the roller mount, the internal rolling bearing with a protective oil seal, and the working body of the roller itself, which is in contact with the belt.

1. ASTRA J Sports Tourer (P10)
2. DOBLO Cargo (263_)
3. GIULIETTA (940_)
4. ASTRA Mk VI (J) Estate (P10)
5. MUSA (350_)
6. DOBLO Box Body/MPV (223_)
7. DOBLO MONOCAB (223_)
8. BRAVA (182_)
9. BRAVO I (182_)
10. MAREA (185_)
11. MAREA Weekend (185_)
12. INSIGNIA Mk I (A) Sports Tourer (G09)
13. BRAVO II (198_)
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15. BRERA (939_)
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17. 156 (932_)
18. 159 (939_)
19. 159 Saloon (939_)
20. 159 Sportwagon (939_)
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The principles of the timing belt tensioner work

Excessive tension leads to intensive wear of the timing parts - pulley bearings (water pump, generator, tensioner, etc.), the belt itself, and others. In addition, a tight belt stretches faster and shortens its service life. Too little preload is fraught with more serious problems - slipping of the belt along the toothed pulleys of the camshafts, which leads to a violation of the valve timing and deterioration of the entire engine.

Therefore, a tensioning device is introduced into the timing drive in the form of rollers of one design or another, which, during engine operation, maintain an optimal belt tension.